<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 块1的下边的margin为10px -->
<div style="margin-bottom: 10px">块1</div>
<!-- 块2的上边的margin为5px -->
<div style="margin-top: 5px">块2</div>
</body>
</html>